Ericsson A2618s Troubleshooting Manual
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Ericsson A2618s Troubleshooting Manual

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Trouble Shooting Guide, Advanced
Applicable for A2618s
Contents
1 Explanations .........................................................................................................................2
2 On/Off, Enter Test Program ...............................................................................................6
3 EPROM...............................................................................................................................10
4 ADC-Calibration (Voltage-Calibration) ..........................................................................12
5 BDATA-Calibration...........................................................................................................15
6 Current Calibration ...........................................................................................................16
7 Network Problems..............................................................................................................20
8 LO Fault ..............................................................................................................................30
9 VCXO ..................................................................................................................................32
10 RSSI.....................................................................................................................................34
11 Phase and Frequency Error ..............................................................................................36
12 Transient Spectrum (Spectrum due to switching)...........................................................38
14 Burst Timing (Power Time Template) .............................................................................50
15 Calibration Intermediate Power .......................................................................................52
16 Calibration Power Level ....................................................................................................53
17 Audio ...................................................................................................................................56
18 Keyboard.............................................................................................................................65
19 Display.................................................................................................................................67
20 Buzzer..................................................................................................................................69
21 Illumination.........................................................................................................................70
22 Top Indicator ......................................................................................................................71
24 Self-Test...............................................................................................................................75
25 ADC-Values ........................................................................................................................77
26 Revision History .................................................................................................................78
4/00021-3/FEA 209 544/25 C
©
Ericsson Mobile Communications AB
b y T o k o ( t o k o @ g s m - f r e e . o r g )
Trouble Shooting Guide, Advanced
Approved according to 1776-1/FEA 209 544

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  • Page 1: Table Of Contents

    Trouble Shooting Guide, Advanced Trouble Shooting Guide, Advanced Applicable for A2618s b y T o k o ( t o k o @ g s m - f r e e . o r g ) Contents 1 Explanations .........................2 2 On/Off, Enter Test Program ....................6...

  • Page 2: Explanations

    Some replaces of component demands all three calibrations, other only need one or two of the calibrations. Component placement reference For component placement see doc.1078-2/FEA 209 544/25 Service Test Menu Code to enter Service Test Menu, > * < < * < * 4/00021-3/FEA 209 544/25 C 2(78) © Ericsson Mobile Communications AB...
  • Page 3 DC voltage for the real time clock, 2.35 ± 0.15 V VRTC: DC voltage for the synthesiser, 3.8 ± 0.10 V VVCO: I2C: Communications-standard for two-way communication using only 2 wires. 4/00021-3/FEA 209 544/25 C 3(78) © Ericsson Mobile Communications AB...
  • Page 4 Data To Mobile Station, serial bus communication/ External accessory Power on CTS_ON Mobile station Clear To Send/ ON REQuest AFMS/RTS Audio from Mobile station/ Ready To Send ATMS Audio to Mobile station 4/00021-3/FEA 209 544/25 C 4(78) © Ericsson Mobile Communications AB...
  • Page 5 Pin placing Double diode or single Single diode (PIN diode) Electrolytic capacitor. transistor Five pin circuit (usually volt- Double transistor. N392 age regulator). Eight pin circuit. N200 N400 Crystal N300 4/00021-3/FEA 209 544/25 C 5(78) © Ericsson Mobile Communications AB...

  • Page 6: On/Off, Enter Test Program

    If the fault still remains the fault probably is due to N700. Check VBOOST, 4.1 ± 0.10 V and VRAD, 3.8 ± 0.20 V If the measured values are incorrect use the circuit diagram. 4/00021-3/FEA 209 544/25 C 6(78) © Ericsson Mobile Communications AB...
  • Page 7 If VDIG is to low, the fault is due to N700. If VCORE.DSP is too low, change N720, C722 and R732. If the fault still remains, it is probably due to N700. 4/00021-3/FEA 209 544/25 C 7(78) © Ericsson Mobile Communications AB...
  • Page 8 No further action should be taken for a liquid damaged unit, send it on according to the local company directives. Make sure the pads of the system connector not are mechanically or liquid damaged. Attach the board to the fixture. Power up the board. 4/00021-3/FEA 209 544/25 C 8(78) © Ericsson Mobile Communications AB...
  • Page 9 If the fault still remains, it is probably due to N700. Check VBOOST 4.1 ± 0.10 V and VRAD, 3.8 ± 0.20 V If the measured values are incorrect use the circuit diagram. 4/00021-3/FEA 209 544/25 C 9(78) © Ericsson Mobile Communications AB...

  • Page 10: Eprom

    Make sure there is not a short circuit against ground at I CCLK or I CDAT. Power up the board and check VDIG. The fault is usually due to D602. 4/00021-3/FEA 209 544/25 C 10(78) © Ericsson Mobile Communications AB...
  • Page 11 Make sure there is not a short circuit against ground at I CCLK or I CDAT. Power up the board and check VDIG. The fault is usually due to D602. The values shown in the menu are different for all stations. 4/00021-3/FEA 209 544/25 C 11(78) © Ericsson Mobile Communications AB...

  • Page 12: Adc-Calibration (Voltage-Calibration)

    Fig. 4.1 A new window shows up Fig. 4.2, telling you to change the battery voltage to 4.1 V on the power supply. When you have done that, click on OK. 4/00021-3/FEA 209 544/25 C 12(78) © Ericsson Mobile Communications AB...
  • Page 13 The result is shown in two windows, first ”High ADC calibration” Fig. 4.3 (4.1 V ) and then ”Low ADC calibration” Fig. 4.4 (3.2 V Fig. 4.3 Fig. 4.4 Fig. 4.5 4/00021-3/FEA 209 544/25 C 13(78) © Ericsson Mobile Communications AB...
  • Page 14 4.1 V Table. 4.1 You can check the ADC-values. Go to Logic\Selftest. If Power ASIC passed, the values are in range. If Power ASIC failed it is probably due to N700. 4/00021-3/FEA 209 544/25 C 14(78) © Ericsson Mobile Communications AB...

  • Page 15: Bdata-Calibration

    Fig. 5.1 The limits for the calibration are shown in the table below Fig. 5.2. min. Unit A/D BData Fig. 5.2 If the calibration failed it is probably due to N700. 4/00021-3/FEA 209 544/25 C 15(78) © Ericsson Mobile Communications AB...

  • Page 16: Current Calibration

    V720 and the regulator-control in N700 regulate the charging. How do you perform a current calibration Start the board in EFRA with the test program. Go to Logic \Current calibration. 4/00021-3/FEA 209 544/25 C 16(78) © Ericsson Mobile Communications AB...
  • Page 17 The next window, Fig. 6.3, tells you to type in the read current value from the power supply in mA. Fig. 6.3 Now type in the new value read from the power supply, Fig. 6.4. Fig. 6.4 4/00021-3/FEA 209 544/25 C 17(78) © Ericsson Mobile Communications AB...
  • Page 18 The next window tells you to disconnect the DCIO, Fig. 6.6. Fig. 6.6 The limits for the calibrations are displayed in the table below, Table. 6.1. Selected charge UNIT current 100mA-ADC value 100mA-DCIO current 800mA-ADC value 800mA-DCIO current Table. 6.1. 4/00021-3/FEA 209 544/25 C 18(78) © Ericsson Mobile Communications AB...
  • Page 19 If the voltage is incorrect, the fault depends on R727 or V720. Also measure R726, it should be 0.0 Ohm. If the fault still remains it is probably depending on N700. 4/00021-3/FEA 209 544/25 C 19(78) © Ericsson Mobile Communications AB...

  • Page 20: Network Problems

    If there is to high output power make a calibration. If both the Peak- phase error and the RMS phase error are correct, but the frequency error is large, go to chapter 9 (“VCXO”). 4/00021-3/FEA 209 544/25 C 20(78) © Ericsson Mobile Communications AB...
  • Page 21 Read of the RX-level value on the GSM-test-instrument. The RX level value for each of the channels should be as follow: RX level RX level at -68.5dBm RX level at -102dBm Table 7.2 4/00021-3/FEA 209 544/25 C 21(78) © Ericsson Mobile Communications AB...
  • Page 22 The signal path is partly different for EGSM900 and GSM1800. 7.2.7 For EGSM900 Set Radio in RX Static mode on channel 37, Fig. 7.1. Static RX activates when you have clicked on the Apply-button. 4/00021-3/FEA 209 544/25 C 22(78) © Ericsson Mobile Communications AB...
  • Page 23 Fig. 7.2. Fig. 7.2 The attenuation of the signal over N200 is approximately 7 dBm, and over Z200 is approximately 4 dBm. 942.47 MHz: 4/00021-3/FEA 209 544/25 C 23(78) © Ericsson Mobile Communications AB...
  • Page 24 Follow the RX-signal from the antenna to N300. The signal will have two peaks, that to the right shall be measured (Fig. 7.2). The attenuation of the signal over N200 is approximately 7 dBm, and over Z201 is approximately 4 dBm. 4/00021-3/FEA 209 544/25 C 24(78) © Ericsson Mobile Communications AB...
  • Page 25 When the transmitter locks on, check the output power (30 – 35 dBm) at the antenna connector using the spectrum analyser. If there is an output power problem go to section 7.3.2. If there is a frequency fault go to section 7.4. 4/00021-3/FEA 209 544/25 C 25(78) © Ericsson Mobile Communications AB...
  • Page 26 If the output power value is higher than in Table 7.5, go to section 7.3.2. If the output power value is lower than in Table 7.5, go to section 7.3.3. 4/00021-3/FEA 209 544/25 C 26(78) © Ericsson Mobile Communications AB...
  • Page 27 If the fault remains it can be due to C405, C406, C408, or N200. If only the signal at D401 is missing the fault is due to D401 or N400. 4/00021-3/FEA 209 544/25 C 27(78) © Ericsson Mobile Communications AB...
  • Page 28 All the mentioned signal strength levels are approximately, especially when measuring at the signal before the power amplifier, since its output power radiates back to the probe. This has to be considered when comparing measured values with reference values. 4/00021-3/FEA 209 544/25 C 28(78) © Ericsson Mobile Communications AB...
  • Page 29 Compare the signals with a reference-board. If the signal is different, replace the resistor and the capacitor (C520 or C522). If all signals are correct, the fault is due to D600, N500 or N300. 4/00021-3/FEA 209 544/25 C 29(78) © Ericsson Mobile Communications AB...

  • Page 30: Lo Fault

    If the LO signal is correct as in Fig. 8.1, check the signal path for RX (chapter 7.2.) and TX (chapter 7.3.), often there is a fault in the logic. If the frequency or the amplitude is incorrect, check VVCO to N301 at R300. 4/00021-3/FEA 209 544/25 C 30(78) © Ericsson Mobile Communications AB...
  • Page 31 If the voltage is too low, check C302, L300, C300 and C301. If the fault remains check the feed voltage 3.8 V at pin 22, 46 and 47 of N300. 4/00021-3/FEA 209 544/25 C 31(78) © Ericsson Mobile Communications AB...

  • Page 32: Vcxo

    The frequency of the oscillating circuit is amplified in N300 and goes to the radio and the logic through two outputs called 13MHz and MCLK. The VCXO (13 MHz crystal) is trimmed in EFRA-calibration. 4/00021-3/FEA 209 544/25 C 32(78) © Ericsson Mobile Communications AB...
  • Page 33 If both voltages are correct, but the VCXO calibration is incorrect, the fault usually is due to B320, V321 or V322. Sometimes is it due to C321 – C324. VCXO faults can be due to N300, but that is not very common. 4/00021-3/FEA 209 544/25 C 33(78) © Ericsson Mobile Communications AB...

  • Page 34: Rssi

    The information about the amplitude corresponds to the strength of the received RF-signal, i.e. the RF-level at the antenna input of the receiver. 4/00021-3/FEA 209 544/25 C 34(78) © Ericsson Mobile Communications AB...
  • Page 35 If RSSI for an input signal of –50 dBm is low, is it advisable to follow the signal to find the component that attenuates the signal too much, go to chapter 7 (“No serv/Networks problems”). 4/00021-3/FEA 209 544/25 C 35(78) © Ericsson Mobile Communications AB...

  • Page 36: Phase And Frequency Error

    Max RMS phase error Max peak phase error Max frequency error Table 11.1 GSM 1800 Parameter Value Unit Max RMS phase error Max peak phase error Max frequency error Table 11.2 4/00021-3/FEA 209 544/25 C 36(78) © Ericsson Mobile Communications AB...
  • Page 37 Notice that the calibration demands test program in the phone while the Go/No Go –test demands signal program. The few times the fault is electrical, is it usually due to B320 or N400. The fault can also be due to N392. 4/00021-3/FEA 209 544/25 C 37(78) © Ericsson Mobile Communications AB...

  • Page 38: Transient Spectrum (Spectrum Due To Switching)

    The Zero Power level is a voltage level from the DAC that assures no output power at all. The amplified and filtrated control voltage is called PAREG and looks like the Fig. 12.2 below. 4/00021-3/FEA 209 544/25 C 38(78) © Ericsson Mobile Communications AB...
  • Page 39 Then you compensate the spectrum analyser until the correct output power is achieved. Convenient settings for this are: CF – 902.8, SPAN – 0 MHz, RBW – 300 kHz, VBW – 100 kHz and SWEEP – 0.8 ms.) 4/00021-3/FEA 209 544/25 C 39(78) © Ericsson Mobile Communications AB...
  • Page 40 Same as for EGSM900, but do not forget to change to GSM1800 and Power level 0 in the test program, also change CF at the spectrum analyser. The Power level must be inside the limits, Table 12.1. 4/00021-3/FEA 209 544/25 C 40(78) © Ericsson Mobile Communications AB...
  • Page 41 If the up and down ramping does not look like the pictures, the fault can be due to the exponential amplifier, the low pass filter or the offset voltage. All three of the parts are functions in N700. 4/00021-3/FEA 209 544/25 C 41(78) © Ericsson Mobile Communications AB...

  • Page 42: Modulation Spectrum Switched Mode (Spectrum Due To Modulation)

    Same control functionality, as in the previous upramp, over three steps and a besselfilter, is also utilised for the downramp. 4/00021-3/FEA 209 544/25 C 42(78) © Ericsson Mobile Communications AB...
  • Page 43 This combination of time and frequency TS / ARFCN, is called a physical channel. The system also has the ability to change the ARFCN each time the physical channel is opened, in a programmable so called frequency hopping pattern controlled by the switch. 4/00021-3/FEA 209 544/25 C 43(78) © Ericsson Mobile Communications AB...
  • Page 44 But for testing at normal maintenance and repair, it is permitted to reduce the test and simplify for economical reasons, at a reasonable level. 4/00021-3/FEA 209 544/25 C 44(78) © Ericsson Mobile Communications AB...
  • Page 45 In the middle of the burst there is a training sequence usually called midamble, with an equal bit pattern in every normal burst. This part is not interesting for modulation measurements either. 4/00021-3/FEA 209 544/25 C 45(78) © Ericsson Mobile Communications AB...
  • Page 46 When compared to the reference, each of the two adjacent RF-channels gets a lower value, calculated as a difference in dBc down from the Fc. The smallest difference is the valid measurement result. (Easiest to achieve, but closest to the limit). 4/00021-3/FEA 209 544/25 C 46(78) © Ericsson Mobile Communications AB...
  • Page 47 This is the measurement result of Spectrum due to the Modulation and wide band noise and will be examined according to the requirements specification in the document 1524 TEST DATA written and approved by the Ericsson Test engineering and based on the GSM specification.
  • Page 48 The signals MODIP at R515 and MODQN at R512 (should look like Fig. 13.3) and the frequency is 216 HZ. Fig. 13.3 The signals MODIN at R514 and MODQP at R513 (should look like Fig. 13.4) and the frequency is 216 Hz. 4/00021-3/FEA 209 544/25 C 48(78) © Ericsson Mobile Communications AB...
  • Page 49 Noise can also come from the PLL-circuit and components around it. If some signal is incorrect the fault is probably due to R512 – R515 or C520/C522. If all signals are incorrect he fault is probably due to D600. 4/00021-3/FEA 209 544/25 C 49(78) © Ericsson Mobile Communications AB...

  • Page 50: Burst Timing (Power Time Template)

    This let you know if the burst is within the limit. Table 14.1 and Table 14.2 below show the limits of the timing for all power levels in EGSM 900 and GSM 1800. 4/00021-3/FEA 209 544/25 C 50(78) © Ericsson Mobile Communications AB...
  • Page 51 If the fault is electrical it is usually due to N700 or N400, but it can also be due to C498 or C499. 4/00021-3/FEA 209 544/25 C 51(78) © Ericsson Mobile Communications AB...

  • Page 52: Calibration Intermediate Power

    (Table 15.1). Parameter Units -10 µs/P1 5 -18 µs/P1 5 -10 µs/P1 9 -18 µs/P1 9 -10 µs/P1 19 Table 15.1 4/00021-3/FEA 209 544/25 C 52(78) © Ericsson Mobile Communications AB...

  • Page 53: Calibration Power Level

    The regulation is fed back by measuring the current consumption of the power amplifier using V400. The signals are called PASENSE+ and PASENSE-. Table 16.1 (EGSM900) and Table 16.2 (GSM1800) shows the default DAC values and the output power goal of the calibration. 4/00021-3/FEA 209 544/25 C 53(78) © Ericsson Mobile Communications AB...
  • Page 54 Table 16.1 Power Level DAC Value Output (lsb) Power Default (dBm) 30.0±0.3 28.0±0.5 26.0±0.5 24.0±0.5 22.0±0.5 20.0±0.5 18.0±0.5 16.0±0.5 14.0±0.5 12.0±0.5 10.0±0.5 8.0±0.5 6 .0±0.5 4.0±0.5 2.0±0.5 0.0±0.5 Table 16.2 4/00021-3/FEA 209 544/25 C 54(78) © Ericsson Mobile Communications AB...
  • Page 55 EEPROM. 16.2 How do you find the fault If the power calibration failed, go to the chapter 7.3 (“TX-fault”). 4/00021-3/FEA 209 544/25 C 55(78) © Ericsson Mobile Communications AB...

  • Page 56: Audio

    Fig. 17.1 In the trouble shooting part of EFRA there is several ways to test the audio function. There are five different ways to connect an audio signal Fig. 17.2. 4/00021-3/FEA 209 544/25 C 56(78) © Ericsson Mobile Communications AB...
  • Page 57 PCMDLD to be DA converted in a PCM decoder and filtered in N500. The signal is amplified and then connected through N501, to the AMFS_RTS pin (pin10) of the system connector. 4/00021-3/FEA 209 544/25 C 57(78) © Ericsson Mobile Communications AB...
  • Page 58 At the test “ATMS – Earphone” you should hear the chosen input signal (1 kHz) in the earphone. At the test “Mic – AFMS” a whistle in the microphone should be seen as a sinus shaped curve at the oscilloscope. 4/00021-3/FEA 209 544/25 C 58(78) © Ericsson Mobile Communications AB...
  • Page 59 If there is a sinus signal (50 mV rms) at N500 the fault is probably due to N500, but it can also be D600 or D500. The reference voltages at N500 should also be measured, they should be : 4/00021-3/FEA 209 544/25 C 59(78) © Ericsson Mobile Communications AB...
  • Page 60 No further action should be taken for a liquid damaged unit, send it on according to the local company directives. Make sure the system connector pads not is oxidised or burned. 4/00021-3/FEA 209 544/25 C 60(78) © Ericsson Mobile Communications AB...
  • Page 61 If the signal is missing at N500 (X510), the fault mostly is due to N501. But it can also be due to N500. Check the signal at C508, if its missing the fault probably is due to N500. 4/00021-3/FEA 209 544/25 C 61(78) © Ericsson Mobile Communications AB...
  • Page 62 Do not forget to mount all the components that have been removed. The short circuit is can be due to D500. If the feed voltage is too high, replace N720. 4/00021-3/FEA 209 544/25 C 62(78) © Ericsson Mobile Communications AB...
  • Page 63 If the resistor is mounted and got correct resistance, the fault usually is due to N500, but sometimes is it due to D600 or D500. A self-test of the phone in EFRA could be useful to determine which of the circuits that could be faulty. 4/00021-3/FEA 209 544/25 C 63(78) © Ericsson Mobile Communications AB...
  • Page 64 If the voltage is incorrect, check the signal between D800 and D600, measure at X804 (the test-point close to V850). If the signal is correct at X804 it probably is D800 that is faulty, if it is incorrect it is D600 that occurs the fault. 4/00021-3/FEA 209 544/25 C 64(78) © Ericsson Mobile Communications AB...

  • Page 65: Keyboard

    Press all keys to find which is faulty. If one or more of the keys at the keyboard is faulty, go to section 18.3 If the volume adjustment does not work, go to section 18.4 4/00021-3/FEA 209 544/25 C 65(78) © Ericsson Mobile Communications AB...
  • Page 66 X851 and X852. If it is incorrect, measure the resistance of R853 (33 ohms) and R857 (33 ohms). If the fault remains usually it is due to D600 or a foil damage. 4/00021-3/FEA 209 544/25 C 66(78) © Ericsson Mobile Communications AB...

  • Page 67: Display

    2.7 ± 0.10 V RESET LCD: 2.7 ± 0.10 V VDIG: 2,7 ± 0.10 V C DAT: 2,7 ± 0.10 V C CLK: VLCD: This voltage is generated in the display-assembly. 4/00021-3/FEA 209 544/25 C 67(78) © Ericsson Mobile Communications AB...
  • Page 68 If the voltage still is incorrect, check that there is VDIG at R802 (4,7 kohms). If the voltage still is incorrect it is due to D600 or a foil damage. 19.5 Display calibration The contrast might be adjusted (calibrated) using the Service Test Menu. 4/00021-3/FEA 209 544/25 C 68(78) © Ericsson Mobile Communications AB...

  • Page 69: Buzzer

    If there is a signal at R851 the fault probably is due to V851. If there is no signal at R851 at the side toward the processor, the fault is due to D600 or a foil damage. 4/00021-3/FEA 209 544/25 C 69(78) © Ericsson Mobile Communications AB...

  • Page 70: Illumination

    If the LCD LED does not work it probably is due to V853. If the KEY LED does not work it probably is due to V854. If there is no ILLUM-signal it probably is due to D600 or a foil damage. 4/00021-3/FEA 209 544/25 C 70(78) © Ericsson Mobile Communications AB...

  • Page 71: Top Indicator

    The signal TOP LED is low when activated, if not check R860 (150 ohms). If there is no signal at R860, the fault probably is due to D600 or a foil damage. 4/00021-3/FEA 209 544/25 C 71(78) © Ericsson Mobile Communications AB...

  • Page 72: Sim-Fault ("Insert Card")

    No further action should be taken for a liquid damaged unit, send it on according to the local company directives. Power up the board and start it in EFRA with the test program. Go to Logic/Logic/SIM, Fig. 23.1. Fig 23.1 4/00021-3/FEA 209 544/25 C 72(78) © Ericsson Mobile Communications AB...
  • Page 73 D600 at X802 at the test-point closest to C723. If SIMRST is missing, it can depend on D600 or a foil damage. If it is correct, the fault can depend on N700, R805, C806 or V805. 4/00021-3/FEA 209 544/25 C 73(78) © Ericsson Mobile Communications AB...
  • Page 74 Measure the resistance on J800: 5 against ground (0.0 Ohm). If the resistance is correct, the fault can be due to D600, N700 or bad soldering at any of the components mentioned in this chapter. 4/00021-3/FEA 209 544/25 C 74(78) © Ericsson Mobile Communications AB...

  • Page 75: Self-Test

    Checks the function of the ALARMON signal. The ONSWAn signal is measured when DCON is set high and low. A correctly performed test should look like Fig. 24.1. Fig. 24.1 4/00021-3/FEA 209 544/25 C 75(78) © Ericsson Mobile Communications AB...
  • Page 76 Mainly it is B800 that is faulty, but sometime it is due to C800, C801 or C771. 24.7 Check the ALARMON signal Open the phone and check for water damage. The fault can be due to V600 but usually is D600 or N700 faulty. 4/00021-3/FEA 209 544/25 C 76(78) © Ericsson Mobile Communications AB...

  • Page 77: Adc-Values

    R505, R506 or N500. 25.2 VBATT ADC limits for “VBATT” is shown in the Table 25.2 below. VBATT(V) min. UNIT 3.2 V 4.1 V Table 25.2 4/00021-3/FEA 209 544/25 C 77(78) © Ericsson Mobile Communications AB...

  • Page 78: Revision History

    Chapter 1.1_using the ”Go to call processing” is added. Chapter 2.4.1_ EMMA II-flash instead of EFRA-flash. 2001-05-10 Document updated to include A2638sc (only for China). Corrections in spelling and grammar. 4/00021-3/FEA 209 544/25 C 78(78) © Ericsson Mobile Communications AB...

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